package online.hxstar.learn.udp;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.CharsetUtil;

import java.util.concurrent.ThreadLocalRandom;

/**
 * @author huxing
 * @date 2018-12-18 16:00
 */
public class ChineseProverbServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    private static final String[] DICTIONATY = {"只要功夫深,铁棒磨成针."
            , "旧时王谢堂前燕,飞入寻常百姓家."
            , "洛阳亲友如相问,一片冰心在玉壶."
            , "一寸光阴一寸金,寸金难买寸光阴."
            , "老骥伏枥,志在千里,烈士暮年,壮心不已"};

    @Override
    protected void messageReceived(ChannelHandlerContext ctx, DatagramPacket msg) throws Exception {

        String req = msg.content().toString(CharsetUtil.UTF_8);
        System.out.println(req);
        if ("谚语字典查询?".equals(req)) {
            ctx.writeAndFlush(new DatagramPacket(Unpooled.copiedBuffer(
                    "谚语查询结果:" + nextQuote(), CharsetUtil.UTF_8)
                    , msg.sender()));
        }
    }

    private String nextQuote() {

        int quoteId = ThreadLocalRandom.current().nextInt(DICTIONATY.length);
        return DICTIONATY[quoteId];
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
        cause.printStackTrace();
    }
}
